Democratic victories to constrain President Trump and increase tech scrutiny

Democratic control of both chambers will constrain President Trump’s domestic agenda and push his administration toward foreign policy, trade and executive action, increasing market and geopolitical uncertainty.

• The Democrats’ decisive Senate and House victories remove the prospect of major tax and spending changes, while large fiscal deficits and deteriorating debt dynamics remain in place.
• A debt-ceiling confrontation could emerge by mid-2027 and produce a government shutdown longer than the previous October shutdown, which reduced fourth-quarter 2025 GDP growth by 1 percentage point.
• Democratic control of oversight committees is likely to increase scrutiny of AI and technology companies, while local leaders may resist data-centre construction and fossil-fuel projects.
• With Congress gridlocked, Trump is expected to focus on Iran, Russia and Ukraine, tariffs, trade and national security, while Democrats can delay appointments and investigate the administration.
• The authors expect front-end Treasury yields to drift lower while the long end retains an upward bias, with the 10-year yield headed toward 5.25%; tariffs could add revenue but also raise inflation.
• The dollar may weaken into 2027 as Democrats challenge deregulation and the AI build-out, while Europe faces risks from trade tensions, energy prices and possible pressure over Russia and Ukraine.

Takeaway: Investors should expect constrained domestic policymaking alongside greater foreign-policy and trade volatility, with persistent fiscal concerns weighing on long-term Treasuries and a weaker dollar becoming more likely into 2027.